A corrosion inhibitor is a substance that, when added to a liquid or gas, reduces the rate of corrosion of materials, particularly metals. Corrosion occurs when metals react with environmental elements like moisture, oxygen, and salts, leading to deterioration. Inhibitors work by forming a protective layer on the metal surface or by neutralizing corrosive agents. These inhibitors are commonly used in various industries, including oil and gas, water treatment, and automotive. They can be organic compounds, inorganic compounds, or even coatings that help extend the lifespan of equipment and structures by minimizing damage from corrosion.